Trying to work out if this is a problem or just how the system works:

When dis-engaging the high beams it looks as though the halogen bulbs immediately turn off but it takes a few seconds before the xenons adjust downward. So you temporarily have more light than normal dipped beam, but not as much as high beam.

Is this normal or something I should e getting looked at?

Cheers

from high beam xenon to dip should be fairly instant , maybe something wrong with the shutters?

no mate....thats not right, if you turn on or off high beam you should have instant light switching....something is a miss there.

I notice that when the dipped lights first come on they are brighter for a moment and then settle back to the normal level. I assumed that was a feature of Xenon lights and have not worried about it. Only Range Rovers since 1988

^ tis normal chris..

Was indeed the shutters. New headlight unit being fitted by the selling dealer to fix it.
Cheers chaps